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Control scheme for an evaporator operating at conditions approaching thermodynamic limits

a control scheme and evaporator technology, applied in domestic cooling devices, lighting and heating devices, domestic applications, etc., can solve problems such as water freezing in the evaporator

Active Publication Date: 2009-09-01
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system maintains reliable vaporization of liquid evaporant near thermodynamic limits, preventing freezing and ensuring consistent operation across varying temperature conditions.

Problems solved by technology

Slight changes in pressure and temperature can result in freezing of water within the evaporator.

Method used

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  • Control scheme for an evaporator operating at conditions approaching thermodynamic limits
  • Control scheme for an evaporator operating at conditions approaching thermodynamic limits
  • Control scheme for an evaporator operating at conditions approaching thermodynamic limits

Examples

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Embodiment Construction

[0013]Referring to FIG. 1, an example evaporative heat exchange assembly 10 includes three evaporative heat exchangers 12, 14, and 16 into which is fed a heat transfer medium 44 that carries heat from a heat generating system 56 to an inlet 30 of the assembly 10. The heat transfer medium 44 flows into the inlet 30 and rejects heat to emerge from an outlet 32 at a lower temperature. The heat rejected from the heat transfer medium 44 is accepted by an evaporant 46 fed separately to each of the evaporative heat exchangers 12, 14 and 16. The evaporant 46 enters each of the heat exchangers 12, 14 and 16 in a liquid form and vaporizes upon encountering heat given off by the heat transfer medium 44. The vaporized evaporant 46 is exhausted into an ambient environment 36.

[0014]The example assembly 10 operates where the ambient environment 36 is at or near the vacuum of space. The example evaporant 46 is water as it is a weight efficient evaporant with a latent heat of 1000 BTU / lb (2326.000 J...

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Abstract

A heat exchanger assembly includes a plurality of evaporative heat exchangers that are selectively feed evaporant to tailor operation to current heat load in order to maintain operation in thermodynamically extreme operating conditions.

Description

BACKGROUND OF THE INVENTION[0001]This invention generally relates to a method of controlling an evaporative heat exchanger. More particularly, this invention relates to a control scheme for operating an evaporative heat exchanger that exhausts to space vacuum.[0002]Evaporative heat exchangers are utilized in applications where a conventional radiator cannot be utilized. An evaporative heat exchanger includes a cooling medium that accepts heat from another system and exhausts that heat to an ambient environment. Water is a very efficient cooling medium with a latent heat of 1000 BTU / lb (2326.000 J / kg). The favorable latent heat to weight ratio makes water a suitable choice for use in vehicles operating in extreme conditions with restrictive space and weight requirements.[0003]The conditions in which evaporative heat exchangers are utilized in a space vacuum are at the extreme thermodynamic conditions for water. Slight changes in pressure and temperature can result in freezing of wate...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F28D15/02F28D15/06
CPCF28F27/003
Inventor O'CONNOR, EDWARD W.
Owner HAMILTON SUNDSTRAND CORP